Sink

The word sink is a noun. Sink means (1) a covered cistern; waste water and sewage flow into it, (2) plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe, (3) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof, (4) (technology) a process that acts to absorb or remove energy or a substance from a system.
Sink is also a verb that means (1) fall heavily or suddenly; decline markedly, (2) embed deeply, (3) descend into or as if into some soft substance or place, (4) pass into a specified state or condition, (5) fall or drop to a lower place or level, (6) cause to sink, (7) fall or sink heavily, (8) go under, "The raft sank and its occupants drowned", (9) appear to move downward.

The purpose of a bathroom sink hasn't changed all that much since it was invented. It is still used to hold water so that you can easily wash your hands and face.
http://www.bathroomfixtures.us/sinks.htm

Bathroom sinks are not only a necessity; they can also be an important design element that adds flair to your bathroom. And there are certainly a plethora of sink materials and designs to choose from!
http://www.bathroomsinks.us/

Typical bathroom fixtures include a toilet, sink, and often a bathtub and/or shower. Whether you are seeking to upgrade your current bathroom or design a new one from scratch, this website can help the process.
http://www.bathroomfixtures.us/